Introduction
A solar system consists of a star and all the objects orbiting it as well as all the material in that system. Our Solar System includes the Sun together with the eight planets and their moons as well as all other celestial bodies that orbit the sun.There are the eight primary planets in our solar system, in order from the inner solar system outward.The closest planet to the sun, Mercury is only a bit larger than Earth's moon. Its day side is scorched by the sun and can reach 840 degrees F(450 C).The second (2nd) planet from the sun, Venus is terribly hot. The atmosphere is toxic. The pressure at the surface would crush and kill you. Scientists describe Venus’ situation as a runaway greenhouse effect.The third (3rd) planet from the sun, Earth is a waterworld, with two-thirds of the planet covered by ocean. It’s the only world known to harbor life. Earth’s atmosphere is rich in life-sustaining nitrogen and oxygen.The fourth (4th) planet from the sun, is a cold, dusty place. The dust, an iron oxide, gives the planet its reddish cast. Mars shares similarities with Earth. It is rocky, has mountains and valleys, and storm systems ranging from localized tornado-like dust devils to planet-engulfing dust storms.The fifth (5th) planet from the sun, Jupiter is huge and is the most massive planet in our solar system. It’s a mostly gaseous world, mostly hydrogen and helium. Its swirling clouds are colorful due to different types of trace gases.The sixth (6th) planet from the sun is known most for its rings. When Galileo Galilie first studied Saturn in the early 1600s, he thought it was an object with three parts. Not knowing he was seeing a planet with rings, the stumped astronomer entered a small drawing a symbol with one large circle and two smaller ones in his notebook, as a noun in a sentence describing his discovery.The seventh (7th) planet from the sun, Uranus is an oddball. It’s the only giant planet whose equator is nearly at right angles to its orbit it basically orbits on its side.The eighth (8th) planet from the sun, Neptune is known for strong winds sometimes faster than the speed of sound. Neptune is far out and cold. The planet is more than 30 times as far from the sun as Earth. It has a rocky core.The ninth (9th) planet from the sun well Pluto is unlike other planets in many respects. It is smaller than our moon. Its orbit carries inside the orbit of Neptune and the way out beyond that orbit. Advantages of solar system is it does not cause pollution. However, solar collectors and other associated equipment are manufactured in factories that in turn cause some pollution. In addition,solar system can be used in remote areas where it is too expensive to extend the electricity power grid. Disadvantages of solar system is solar system can only be harnessed when it is daytime and sunny.Solar collectors, panels and cells are relatively
expensive to manufacture although prices are falling rapidly.